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Roberto Durán, byname Manos de Piedra (Spanish: “Hands of Stone”) (born June 16, 1951, Guararé, Panama), Panamanian professional boxer who was world lightweight, welterweight, junior-middleweight, and middleweight champion.

Durán began his professional career on March 8, 1967, and won the first 32 matches of his career, 26 by knockout, before losing for the first time in a 10-round nontitle decision to Esteban De Jesús on November 17, 1972. Earlier that year, on June 26, Durán had knocked out Ken Buchanan in the 13th round to win the world lightweight championship. Durán was successful in all 12 of his subsequent lightweight championship matches, a winning streak that began in 1973 and continued through 1978. He also won all of his nontitle bouts during this period. After moving up to the welterweight division, Durán defeated Sugar Ray Leonard in a 15-round decision on June 20, 1980, to claim the world championship, but in his next fight, on November 25, 1980, he lost the title when Leonard scored an eighth-round knockout. In the second meeting with Leonard, Durán was not actually knocked out. Instead, in an event that became infamous, he refused to continue, surrendering in mid-round with the words “No mas!” (“No more!”).

Durán resumed his career in the summer of 1981 and went on to become the World Boxing Association junior-middleweight champion in 1983 and the World Boxing Council middleweight champion in 1989. By continuing to box for so long (he was still boxing at age 49), he somewhat tarnished his once splendid win record; the “No mas” incident with Leonard dimmed his reputation as well. However, boxing experts agreed that, at the height of his career, Durán was one of the 20th century’s finest fighters.

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